FLAGELLATE PROTOZOA (MASTIGOPHORA) 



249 



45 (44) Body spiral, elongated. 

 Representative species. 



Spiromonas Perty. 



. . Spiromonas angnsta Dujardin 1841, 



Body five or six times as long as broad. Fla- 

 gella subequal, as long as the body, one directed 

 forward; body sometimes temfKjrarily attached 

 by one. Length 10 m- Hay infusions. 



Fig. 382. Spiromonas angusla. X 1000. (After Conn.) 

 There is doubt as to the identity of Conn's form. 



46 (43) Body neither spiral nor oblique 47 



47 (48) Kidney-shaped to spherical; flagella arising from a ventral depres- 

 sion, one trailing. Food absorbed by a dorsal vacuole. 



Pleuromonas Perty. 

 Representative species Pleuromonas jaculans Fcrty 1852. 



Body kidney-shaped, very small; sometimes attached by the pos- 

 terior flagellum. Contractile vacuole anterior; nucleus posterior. 



Length 5 to 9 m- Stagnant water and infusions. Movements 

 jerking and leaping. 



Fig. 383. Pleuromonas j ocularis. X looo. (After Conn.) 



48 (47) Pear-shaped to spindle-shaped; flagella arising from the anterior 

 end, one trailing. Food not taken in by a dorsal vacuole. 



Heteromita Dujardin. 

 Representative species Heteromita ovata Dujardin 1841. 



Body ovate, widest posteriorly. Flagella unequal, the 

 trailing one twice as long as the anterior one. Length 

 25 to 40 ix. River water with aquatic plants. 



Fig. 384. Fleteromita ovata. X 500. (.Alter Conn.) 



49 (38) Flagella usually numerous, frequently arranged in groups. 



Order Phytomastigida 



50 



50 (53) Flagella two in number. 



51 (52) Body expanded into two wings; flagella long. 



Trcpomonas Dujardin. 

 Representative species Trcpomonas agilis Dujardin 1841. 



Very irregular in shape, difTerent ajipcarances being presented 

 from different points of view. The broad, wing-like lateral lobes 

 curve backward nearly to the middle of the bo<ly. Length 20 m. 

 Pond water. 



Fig. 385. Trcpomonas agilis. X 450. (.\fter Conn.) 



